The self-healing capability of cracks plays an important role in improving the durability of concrete. This study investigated the the self-healing capability of mortar with crystalline admixture and fly ash under three conditions. The compressive strength, water absorption, and surface crack pattern were used to evaluate self-healing capability of mortar, and the composition of the healing products was analyzed by x-ray diffraction and scanning electron microscopy. The results indicated that the crystalline admixture could improve the self-healing capability of cementitious materials but caused a negative effect if adding too great an amount of fly ash (≥20%). The specimen that was immersed in water showed favorable self-healing capability of cracks. The healing products in cracks are mainly composed of CaCO₃.

中文翻译：

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不同条件下粉煤灰对结晶外加剂胶凝材料自愈能力的影响

裂缝的自愈能力对提高混凝土的耐久性具有重要作用。本研究考察了三种条件下掺有结晶外加剂和粉煤灰的砂浆的自愈能力。用抗压强度、吸水率和表面裂纹图案来评价砂浆的自愈能力，并通过X射线衍射和扫描电镜分析愈合产物的成分。结果表明，结晶外加剂可以提高胶凝材料的自愈能力，但如果粉煤灰的加入量过大（≥20%），则会产生负面影响。浸入水中的试样显示出良好的裂纹自愈能力。裂缝中的愈合产物主要由CaCO ₃组成.